This paper gives data on the ultraviolet reflecting power of the sulphides of metals (lead, molybdenum, iron, and antimony) having a high metallic luster. The materials examined were the natural minerals û galena, molybdenite, pyrites, and stibnite. It is shown that, in contrast with the metals which have a low reflecting power in the ultraviolet and in the visible spectrum, followed by a high reflecting power in the infrared, the sulphides of these metals have a high selective reflection in the ultraviolet, followed by lower and more uniform reflection in the infrared spectrum. Data are given also on the reflecting power of graphite, duralumin, and magnalium.
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sci vol 19 no 493
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